/Engine/Plugins/Experimental/PCG/Source/PCG/Public/Elements/PCGExecuteBlueprint.h
Returns the labels of custom output pins only.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="PCG|Input & Output") [TSet](API\Runtime\Core\Containers\TSet)< [FName](API\Runtime\Core\UObject\FName) > CustomOutputLabels() const